reapply TextInput es6 conversion with fixes, attemps to fix

Summary: D10515754 reapplied by backing out D12989604 and then fixed by manually forwarding the instance methods to the host function instead of using `forwardRef`. This also removes the need for the $flowFixMe.

Reviewed By: TheSavior

Differential Revision: D13048482

fbshipit-source-id: ff2447aff123e0960eddaef645f7dc976a426e14

Author: sahrens